I'd consider Hahn's Stage 2/2X system as a Stage 2 with around 8 lbs boost and the Stage 2X label meaning the system can be forced to produce more boost by changing springs i the wastegate, with the understanding that going beyond the as-delivered Stage 2 settings really needs a built motor.
I think 2x doesn't require different springs... But I get your point.. I'm gonna stick with stage 2... I've done a lot of searches regarding the 2x setup... Didn't find much, so I'm assuming everyone is having a blast on their stage 2... Should be good enough for me... For now hehe